Android实现多线程下载文件的方法

String fileName = "hetang.mp3"; //开始下载前把下载按钮设置为不可用

downloadbutton.setClickable(false); //进度条设为0

downloadProgressBar.setProgress(0); //启动文件下载线程

new downloadTask("http://www.easck.com/201105110911/AA5CC27CBE34DEB50A194581D1300881/Special_323149/%E8%8D%B7%E5%A1%98%E6%9C%88%E8%89%B2.mp3", Integer.valueOf(downloadTN), dowloadDir + fileName).start(); }

Handler handler = new Handler() {@Overridepublic void handleMessage(Message msg) { //当收到更新视图消息时，计算已完成下载百分比，同时更新进度条信息

int progress = (Double.valueOf((downloadedSize * 1.0 / fileSize * 100))).intValue(); if (progress == 100) {downloadbutton.setClickable(true);

downloadinfo.setText("下载完成！"); Dialog mdialog = new AlertDialog.Builder(ThreadDownloadDemo.this).setTitle("提示信息").setMessage("下载完成，总用时为:"+(SystemClock.currentThreadTimeMillis()-downloadtime)+"毫秒").setNegativeButton("确定", new DialogInterface.OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which) {dialog.dismiss();

}}).create(); mdialog.show();

} else { downloadinfo.setText("当前进度:" + progress + "%");

} downloadProgressBar.setProgress(progress);

} };

public class downloadTask extends Thread {private int blockSize, downloadSizeMore; private int threadNum = 5;

String urlStr, threadNo, fileName; public downloadTask(String urlStr, int threadNum, String fileName) {

this.urlStr = urlStr; this.threadNum = threadNum;

this.fileName = fileName; }

@Overridepublic void run() { FileDownloadThread[] fds = new FileDownloadThread[threadNum];

try {URL url = new URL(urlStr); URLConnection conn = url.openConnection();

//防止返回-1 InputStream in = conn.getInputStream();

//获取下载文件的总大小 fileSize = conn.getContentLength();

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Android实现多线程下载文件的方法

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